Image analysis method without computation of an installation angle and related camera apparatus

An image analysis method applied to a camera apparatus having an operation processor and an image receiver, and adapted to analyze a landform inside a detection image captured by the image receiver via a predefined installation angle, the image analysis method comprising:

• the operation processor dividing the detection image into a plurality of first regions to acquire a plurality of first heights of the plurality of first regions relative to the camera apparatus;
• the operation processor defining some of the plurality of first regions having the same height and being adjacent to each other as a first reference plane area to acquire a first plane formula of the first reference plane area;
• the operation processor selecting at least one of the plurality of first regions adjacent to and outside the first reference plane area, and applying the first plane formula for the selected at least one first region to acquire a first planar height of the selected at least one first region;
• the operation processor comparing the first planar height with an initial first height of the selected at least one first region;
• and
• the operation processor determining a landform relation between the first reference plane area and the selected at least one first region relative to the camera apparatus in accordance with a comparison result.